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AM79574 Datasheet

Subscriber Line Interface Circuit

www.DataSheet4U.com Am79574 Subscriber Line Interface Circuit DISTINCTIVE CHARACTERISTICS s Programmable constant resistance feed s Line-feed characteristics independent of battery variations s Programmable loop-detect threshold s On-chip switching regulator for low-power dissipation s Pin for external ground-key noise filter capacitor available s.

AMD
AM79574.pdf

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AMD AM79574 Datasheet
www.DataSheet4U.com Am79574 Subscriber Line Interface Circuit DISTINCTIVE CHARACTERISTICS s Programmable constant resistance feed s Line-feed characteristics independent of battery variations s Programmable loop-detect threshold s On-chip switching regulator for low-power dissipation s Pin for external ground-key noise filter capacitor available s Ground-key detect option available s Two-wire impedance set by single external impedance s Polarity reversal feature s Tip Open state for ground-start lines s Test relay driver optional s On-hook transmission BLOCK DIAGRAM (TIP) A Ring Relay Driver Test Relay Driver RINGOUT TESTOUT C1 C2 C3 C4 E1 E0 DET GKFIL VTX RSN HPA Ground-Key Detector Input Decoder and Control Two-Wire Interface HPB Signal Transmission B(RING) Power-Feed Controller DA DB VREG L VBAT BGND Off-Hook Detector RD RDC Ring-Trip Detector Switching Regulator CHS QBAT CHCLK VCC VEE AGND 16855C-001 Notes: 1. Am79574—E0 and E1 inputs; ring and test relay drivers s.





www.DataSheet4U.com Am79574 Subscriber Line Interface Circuit DISTINCTIVE CHARACTERISTICS s Programmable constant resistance feed s Line-feed characteristics independent of battery variations s Programmable loop-detect threshold s On-chip switching regulator for low-power dissipation s Pin for external ground-key noise filter capacitor available s.

AMD
AM79574.pdf

Preview
Preview


Preview

AMD AM79574 Datasheet
www.DataSheet4U.com Am79574 Subscriber Line Interface Circuit DISTINCTIVE CHARACTERISTICS s Programmable constant resistance feed s Line-feed characteristics independent of battery variations s Programmable loop-detect threshold s On-chip switching regulator for low-power dissipation s Pin for external ground-key noise filter capacitor available s Ground-key detect option available s Two-wire impedance set by single external impedance s Polarity reversal feature s Tip Open state for ground-start lines s Test relay driver optional s On-hook transmission BLOCK DIAGRAM (TIP) A Ring Relay Driver Test Relay Driver RINGOUT TESTOUT C1 C2 C3 C4 E1 E0 DET GKFIL VTX RSN HPA Ground-Key Detector Input Decoder and Control Two-Wire Interface HPB Signal Transmission B(RING) Power-Feed Controller DA DB VREG L VBAT BGND Off-Hook Detector RD RDC Ring-Trip Detector Switching Regulator CHS QBAT CHCLK VCC VEE AGND 16855C-001 Notes: 1. Am79574—E0 and E1 inputs; ring and test relay drivers s.







 

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